from flask import render_template, flash, redirect, url_for
from app.forms import LoginForm
from flask_login import current_user,login_user,logout_user,login_required
from app import app,db
from werkzeug.urls import url_parse
from flask import request
from app.models import User
from app.forms import RegistrationForm,EditProfileForm
from datetime import datetime
from app.forms import PostForm,ResetPasswordRequestForm,ResetPasswordForm
from app.email import send_password_reset_email
from app.models import Post


##自定义的错误处理程序需要在主程序中引入
from app import errors



@app.before_request
def before_request():
    if current_user.is_authenticated:
        current_user.last_seen = datetime.utcnow()
        db.session.commit()

@app.route('/index',methods=['POST','GET'])
@login_required
def index():
    title = "My first lensson!"
    user = {"username":"sunboy"}

    form = PostForm()
    if form.validate_on_submit():
        post = Post(body=form.post.data,author=current_user)
        db.session.add(post)
        db.session.commit()
        flash("Your post is now live!")
        return redirect(url_for('index'))
    #模拟用户和动态
    # posts = [
    #     {
    #         "author":{"username":"John"},
    #         "body":"Beautiful day in Portland!"
    #     },
    #     {
    #         "author":{"username":"Sam"},
    #         "body":"I'm a suunny boy!"
    #     }
    # ]
    #return render_template('index.html', title=title, posts=posts)

    #posts = current_user.followed_posts().all()
    #分页
    page = request.args.get('page',1,type=int)
    posts = current_user.followed_posts().paginate(
        page,app.config['POST_PER_PAGE'],False
    )
    next_url = url_for('index',page=posts.next_num) if posts.has_next else None
    prev_url = url_for('index',page=posts.prev_num) if posts.has_prev else None


    return render_template('index.html',title="Home Page",form=form,posts=posts.items,prev_url=prev_url,next_url=next_url)




@app.route('/login',methods=['POST',"GET"])
def login():
    if current_user.is_authenticated:
        return redirect(url_for('index'))

    form = LoginForm()
    ##接收处理数据
    if form.validate_on_submit():
        user = User.query.filter_by(username=form.username.data).first()
        if user is None or not  user.check_password(form.password.data):
            flash("Invalid username or password")
            return redirect(url_for('login'))
        #flash("Login requested for user {}, remember_me={}".format(form.username.data,form.remember_me.data))
        login_user(user,remember=form.remember_me.data)
        #return  redirect(url_for('index'))
        #改变url，使用next_url
        next_page = request.args.get('next')
        if not next_page or url_parse(next_page).netloc != "":
            next_page = url_for('index')
        return redirect(next_page)

    return render_template('login.html',title='Sign In',form=form)

@app.route('/logout')
def logout():
    logout_user()
    return redirect(url_for('index'))

@app.route('/register',methods=["POST","GET"])
def register():
    if current_user.is_authenticated:
        return redirect(url_for('index'))
    form = RegistrationForm()
    if form.validate_on_submit():
        user = User(username=form.username.data,email=form.email.data)
        user.set_password(form.password.data)
        db.session.add(user)
        db.session.commit()
        flash("Configurations, you are now a registered user!")
        return redirect(url_for('index'))
    return render_template('register.html',title="Register",form=form)

@app.route('/user/<username>')
@login_required
def user(username):
    user = User.query.filter_by(username=username).first_or_404()
    # posts = [
    #     {"author":user,  "body":"Test post 1#"},
    #     {"author": user, "body": "Test post 2#"}
    # ]
    page = request.args.get('page', 1, type=int)
    posts = user.posts.order_by(Post.timestamp.desc()).paginate(
        page, app.config['POST_PER_PAGE'], False)
    next_url = url_for('user', username=user.username, page=posts.next_num) \
        if posts.has_next else None
    prev_url = url_for('user', username=user.username, page=posts.prev_num) \
        if posts.has_prev else None
    return render_template('user.html',user=user,posts=posts.items,next_url=next_url,prev_url=prev_url)

@app.route('/edit_profile',methods=["POST","GET"])
@login_required
def edit_profile():
    form = EditProfileForm()# 新的表单验证相关current_user.username
    if form.validate_on_submit():
        current_user.username = form.username.data
        current_user.about_me = form.about_me.data
        db.session.commit()
        flash("Your changes have been saved")
        return redirect(url_for('edit_profile'))
    elif request.method == "GET":
        form.username.data = current_user.username
        form.about_me.data = current_user.about_me
    return render_template('edit_profile.html',title="Edit Profile",form=form)

@app.route('/follow/<username>')
@login_required
def follow(username):
    user = User.query.filter_by(username=username).first()
    if user is None:
        flash('User {} not found'.format(username))
        return redirect(url_for('index'))
    if user == current_user:
        flash("You cannot follow yourself!")
        return redirect(url_for('user',username=username))
    current_user.follow(user)
    db.session.commit()
    flash("You are following {}!".format(username))
    return redirect(url_for('user',username=username))

@app.route('/unfollow/<username>')
@login_required
def unfollow(username):
    user = User.query.filter_by(username=username).first()
    if user is None:
        flash('User {} not found'.format(username))
        return redirect(url_for('index'))
    if user == current_user:
        flash("You cannot follow yourself!")
        return redirect(url_for('user',username=username))
    current_user.unfollow(user)
    db.session.commit()
    flash("You are not following {}!".format(username))
    return redirect(url_for('user', username=username))

@app.route('/explore')
@login_required
def explore():
    #posts = Post.query.order_by(Post.timestamp.desc()).all()

    page = request.args.get('page', 1, type=int)
    posts = Post.query.order_by(Post.timestamp.desc()).paginate(
        page, app.config['POST_PER_PAGE'], False
    )
    next_url = url_for('explore', page=posts.next_num) if posts.has_next else None
    prev_url = url_for('explore', page=posts.prev_num) if posts.has_prev else None

    return render_template('index.html',title="Explore",posts=posts.items,prev_url=prev_url,next_url=next_url)

@app.route('/reset_password_request',methods=["POST","GET"])
def reset_password_request():
    if current_user.is_authenticated:
        return redirect(url_for('index'))
    form = ResetPasswordRequestForm()
    if form.validate_on_submit():
        user = User.query.filter_by(email=form.email.data).first()
        if user:
            send_password_reset_email(user)
        flash('Check your email for the instructions to reset your password')
        return redirect(url_for('login'))
    return render_template('reset_password_request.html',title="Rest Password",form=form)

@app.route('/reset_password/<token>',methods=["POST","GET"])
def reset_password(token):
    if current_user.is_authenticated:
        return redirect(url_for('index'))
    user = User.verify_reset_password_token(token)
    if not user:
        return redirect(url_for('index'))
    form = ResetPasswordForm()
    if form.validate_on_submit():
        user.set_password(form.password.data)
        db.session.commit()
        flash('Your password has been reset!!!')
        return redirect(url_for('login'))
    return render_template('reset_password.html',form=form)




if __name__ == '__main__':
    app.run()
